Method of making concrete blocks.



l a citizen of the United States, residing at n STATES" PATENT OFFI E-- mam: ZAGELMEYER, F BAY CITY, MICHIGAN.

1,170 791 v f I Specification of Letters Patent. I No Drawing. Application filed August 26, '1914.- Serial n 858,607.

To all whom it may concern:

' Be it known that I, FRANK ZA'GELMEYER,

Bay City, in the county of Bay and State of Michigan, have invented certain new and useful Improvementsin Methods of Making Concrete Blocks; and I do hereby'declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin'the art to which it appertains to make and use the same.

This invention relates to a method of making concrete blocks, and pertains more ar ticularly to an improved method of-ma ing the so-called dry tamped blocks formed with a facing of granite or other rock or similar material.

. The purpose of my invention is to pro ,vide a method of making dry-tamped blocks that are formed with a. facing ofcrushed rock or similar material, whereby the blocks can be rapidly and economically manufactured and cured in large quantities without using more than just enough of the relatively expensive facing material to properly cover the fac e'of the block, and without requiring a great amount of expensive equipment such as molds andforms, which in the. wet process of block making are required to remain on the blocks until'the wet concrete has set.

vWith these and certain other objects in very large output to view which will appear later in the specification, my invention consists in the process and method to be described.

In carrying out vmy-processI first take a pallet of any usual or suitable form, and coat its'surface with glue or other, adhesive that is capable of softening whenmoisture is'applied. A brush or any other suitable means may be employed for applying a film of the adhesive to the surface of the pallet. I then cover the coated surface of the with particles of the granite, rock, material which is to be used shaking off any surplus par- The adhesive is then allowed to harden. I next coverthe un-gummed or exposed surfaces of the rockface material with liquid neat or rich cement, -and'place the pallet that has thus been prepared with its rock. face, within the walls-of themold, to serve temporarily as the bottom of the mold. Thecement coating maybe applied in any suitable manner, as by a brush or by pouring it over the pallet gravel, or other let. liquid with which the neat cement is mixed. of itself mnrnon OF /MAKING concnnrn' BLocKs.

ratented'neb. 8, 191a,

.tamp into the mold upon the-liquid-coated particles of facing material,- a" mass of dry f concrete--by which technical term is meant concrete of such consistency that it I will retain its shape when tamped into a mold. This dry mixture forms the body or backing of the block. As soon as the tamping is'completed the walls of the mold are removed,

pallet, is put aside to take its initial 5 set,

after which it may be removed from the pal-.

let, and the pallet canbe used again. It will be noted, however, that the walls. of the form or-mold are at once available for use 'on a second block as soon as the preceding blockhas been removed, thereby greatly increasing the output of'a. single mold-over the output attained by the wet process, in

1914. That process applies, however, tothe wet or pouring process of block making, in which great numbers of forms were required in order to make large quantlties o blocks in a short space of time. v

The process herein described enables a. be delivered in" a short time by employing only one mold, since the pallets alone are left with the block until the neat cement has setsufiicientlyto permit the removal of the pallet.

An important step in the present process is the applying of the neat cement mixture to the bacl faceof the layer of facing ma terial while the latter 1s glued to the pallet,

mold. By this I means I not only secure a perfect bond be which is independent of the tween the particles of facing material and the relatively dry mass'of tamped concrete that forms the body'of the'blocln but I also accomplish the important taneously softening and consequently loosening the film of glue'or, adhesive that blnds the particles of facing-material to the pail- This result is accomplished by the The dry tamp .materialis not sufficiently wet to adhere to the facin material, or to sufliciently soften the a gessive. The application of liquid neat cement one function of simuland the block, still resting on the which the mold must be permitted to remain in my Patent No. 1, 086,11 6 issuedFebJ3rd,

. the layer of adhesive ticles with liquid neat .the prepared pallet Within the walls of a these results in avery efficient manner.

of making mold totemporari-ly form the bottomof the mold, and filling the mold with dry tamped concrete, fifth,

removingthe' sides of the mold from the block and pallet and allowing the block to remain on, the pallet until after the liquid cement has set.

In testimony whereof, I

ture in presence of two witnesses.

FRANK ZAGELMEYER.

lVitnesses:

JOSEPH V. CARPENTER, BLANOHE HUNT.

aifiiz my sign-a- 20 

